audio_streamer_ohos 0.0.2 audio_streamer_ohos: ^0.0.2 copied to clipboard
Streaming of Pulse-code modulation (PCM) audio from OpenHarmony
import 'dart:math';
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:audio_streamer/audio_streamer.dart';
import 'package:permission_handler/permission_handler.dart';
void main() => runApp(new AudioStreamingApp());
class AudioStreamingApp extends StatefulWidget {
@override
AudioStreamingAppState createState() => new AudioStreamingAppState();
}
class AudioStreamingAppState extends State<AudioStreamingApp> {
int? sampleRate;
bool isRecording = false;
List<double> audio = [];
List<double>? latestBuffer;
double? recordingTime;
StreamSubscription<List<double>>? audioSubscription;
/// Check if microphone permission is granted.
Future<bool> checkPermission() async => await Permission.microphone.isGranted;
/// Request the microphone permission.
Future<void> requestPermission() async =>
await Permission.microphone.request();
/// Call-back on audio sample.
void onAudio(List<double> buffer) async {
audio.addAll(buffer);
// Get the actual sampling rate, if not already known.
sampleRate ??= await AudioStreamer().actualSampleRate;
recordingTime = audio.length / sampleRate!;
setState(() => latestBuffer = buffer);
}
/// Call-back on error.
void handleError(Object error) {
setState(() => isRecording = false);
print(error);
}
/// Start audio sampling.
void start() async {
// Check permission to use the microphone.
//
// Remember to update the AndroidManifest file (Android) and the
// Info.plist and pod files (iOS).
if (!(await checkPermission())) {
await requestPermission();
}
// Set the sampling rate - works only on Android.
AudioStreamer().sampleRate = 22100;
// Start listening to the audio stream.
audioSubscription =
AudioStreamer().audioStream.listen(onAudio, onError: handleError);
setState(() => isRecording = true);
}
/// Stop audio sampling.
void stop() async {
audioSubscription?.cancel();
setState(() => isRecording = false);
}
@override
Widget build(BuildContext context) => MaterialApp(
home: Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
margin: EdgeInsets.all(25),
child: Column(children: [
Container(
child: Text(isRecording ? "Mic: ON" : "Mic: OFF",
style: TextStyle(fontSize: 25, color: Colors.blue)),
margin: EdgeInsets.only(top: 20),
),
Text(''),
Text('Max amp: ${latestBuffer?.reduce(max)}'),
Text('Min amp: ${latestBuffer?.reduce(min)}'),
Text(
'${recordingTime?.toStringAsFixed(2)} seconds recorded.'),
])),
])),
floatingActionButton: FloatingActionButton(
backgroundColor: isRecording ? Colors.red : Colors.green,
child: isRecording ? Icon(Icons.stop) : Icon(Icons.mic),
onPressed: isRecording ? stop : start,
),
),
);
}